forked from mirrors/linux
730926c3b0
On the expectation that some environments may not upgrade libdaxctl (userspace component that depends on the /sys/class/dax hierarchy), provide a default / legacy dax_pmem_compat driver. The dax_pmem_compat driver implements the original /sys/class/dax sysfs layout rather than /sys/bus/dax. When userspace is upgraded it can blacklist this module and switch to the dax_pmem driver going forward. CONFIG_DEV_DAX_PMEM_COMPAT and supporting code will be deleted according to the dax_pmem entry in Documentation/ABI/obsolete/. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
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#include <linux/percpu-refcount.h>
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#include <linux/memremap.h>
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#include <linux/module.h>
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#include <linux/pfn_t.h>
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#include <linux/nd.h>
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#include "../bus.h"
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/* we need the private definitions to implement compat suport */
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#include "../dax-private.h"
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static int dax_pmem_compat_probe(struct device *dev)
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{
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struct dev_dax *dev_dax = __dax_pmem_probe(dev, DEV_DAX_CLASS);
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int rc;
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if (IS_ERR(dev_dax))
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return PTR_ERR(dev_dax);
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if (!devres_open_group(&dev_dax->dev, dev_dax, GFP_KERNEL))
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return -ENOMEM;
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device_lock(&dev_dax->dev);
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rc = dev_dax_probe(&dev_dax->dev);
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device_unlock(&dev_dax->dev);
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devres_close_group(&dev_dax->dev, dev_dax);
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if (rc)
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devres_release_group(&dev_dax->dev, dev_dax);
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return rc;
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}
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static int dax_pmem_compat_release(struct device *dev, void *data)
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{
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device_lock(dev);
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devres_release_group(dev, to_dev_dax(dev));
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device_unlock(dev);
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return 0;
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}
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static int dax_pmem_compat_remove(struct device *dev)
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{
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device_for_each_child(dev, NULL, dax_pmem_compat_release);
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return 0;
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}
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static struct nd_device_driver dax_pmem_compat_driver = {
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.probe = dax_pmem_compat_probe,
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.remove = dax_pmem_compat_remove,
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.drv = {
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.name = "dax_pmem_compat",
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},
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.type = ND_DRIVER_DAX_PMEM,
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};
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static int __init dax_pmem_compat_init(void)
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{
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return nd_driver_register(&dax_pmem_compat_driver);
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}
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module_init(dax_pmem_compat_init);
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static void __exit dax_pmem_compat_exit(void)
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{
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driver_unregister(&dax_pmem_compat_driver.drv);
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}
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module_exit(dax_pmem_compat_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);
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